The problem is not that Facebook and Google are the only advertising platforms. The problem is that they are considered mainstream media and without these two, the trend of cryptocurrencies gaining legitimacy is delayed. That is right, I said delayed not blocked or prevented.
The World Has Changed.
Five years ago, when bitcoin was unknown to most people, this might have been a fatal move. Today is a different story. I recently traveled to a remote mountain town in the interior of Mexico. Everyone I met had heard about Bitcoin and eyes lit up with excitement when I ask if I could pay for lunch with bitcoin.

Today are dozens of websites dedicated to cryptocurrencies, either holding them, exchanging them or just writing about them. Probably the most effective advertising remains on Google, it is called Google Search and it is free.
If someone wants to learn about owning bitcoin or any other currency, there is a ton of educational information.
The Flipside Is Being Ignored.
Not All Regulation Is Inherently Bad.
If we examine the full spectrum of regulation to this point on a global scale there is one common target most everywhere. That is the practice of exchanges. So far there has been little or not regulation, threatened or enacted, to protect investors from loss of funds due to security breaches.
Capitulation Is A Good Sign.